Hi normaly, at least you have two protections, one for shorts and the other is to protect loudspeakers from DC. For shorts you can see Apex AX20 detection pro. This is in amplifire section always and the power resistor R24 act like detection.As you can see in this Apex AX20
This Apex protection is DC protection, short protection and temperature protection.Ok here you have.
Nice work, did you conected the signal ground to the main ground, if you did so you should have to see your work again.Do not forget the signal ground conection
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